Vertical Range (Impulse Response) Menu Press one of the four submenu keys in this menu to set the y-axis of the Impulse Response graph. Key Sequence: Measurements > Impulse Response Vertical Range (Impulse Response) Menu Press one of these submenu keys to set the y‑axis of the Impulse Response graphs. 5dB 10dB 20dB 40dB Back Press this submenu key to the “Impulse Response Menu”.